Reaper of Souls introduced huge, randomized dungeons called Nephalem Rifts to Diablo 3. One run usually takes more than 10 minutes, depending on the difficulty level. Well, here's one Korean gamer who completes a relatively huge dungeon in under 4 minutes on Torment difficulty.

This will make you cry if you're doing these runs, hoping for better gear and loot.

The weapon he's using is the "Wand of Woh", but you can check out his profile over here. Sadly it's in Korean, but if you're familiar with Diablo III items, you'll recognize most of them. And here's the build he's using. These might come in handy if you want to build a similarly powerful wizard.